﻿using System;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.IO.Compression;
using System.Linq;

namespace Sunny.UI;

public static class FileInfoEx
{
    /// <summary>
    /// 运行文件，当文件已经运行时调至前台
    /// </summary>
    /// <param name="file">文件名</param>
    /// <param name="bringToFrontIfRun">运行时调至前台</param>
    public static Process RunExe(this FileInfo file, bool bringToFrontIfRun = true)
    {
        if (file == null || !file.Exists)
        {
            return null;
        }

        if (bringToFrontIfRun)
        {
            foreach (Process oth in Process.GetProcesses())
            {
                if (!string.Equals(oth.ProcessName, file.Name.Replace(file.Extension, ""), StringComparison.CurrentCultureIgnoreCase))
                {
                    continue;
                }

                IntPtr hWnd = oth.MainWindowHandle;
                Win32.User.ShowWindowAsync(hWnd, (int)ProcessWindowStyle.Maximized);
                Win32.User.SetForegroundWindow(hWnd);
                return oth;
            }
        }

        if (file.Directory != null)
        {
            Directory.SetCurrentDirectory(file.Directory.FullName.DealPath());
        }

        return Process.Start(file.FullName);
    }

    /// <summary>
    /// 程序是否为32位程序
    /// </summary>
    /// <param name="file">文件名</param>
    /// <returns>结果</returns>
    public static bool IsPE32(this FileInfo file)
    {
        FileStream stream = File.OpenRead(file.FullName);
        //移动到 e_lfanew 的位置处
        stream.Seek(0x40 - 4, SeekOrigin.Begin);
        byte[] buf = new byte[4];
        stream.Read(buf, 0, buf.Length);
        //根据 e_lfanew 的值计算出Machine的位置
        int pos = BitConverter.ToInt32(buf, 0) + 4;
        stream.Seek(pos, SeekOrigin.Begin);
        buf = new byte[2];
        stream.Read(buf, 0, buf.Length);
        stream.Close();
        //得到Machine的值，0x14C为32位，0x8664为64位
        short machine = BitConverter.ToInt16(buf, 0);
        return machine == 0x14C;
    }

    /// <summary>
    /// 可执行文件是否运行
    /// </summary>
    /// <param name="file">文件名</param>
    /// <returns>是否运行</returns>
    public static bool IsRun(this FileInfo file)
    {
        return file.Exists && Process.GetProcesses().Any(oth => string.Equals(oth.ProcessName, file.NameWithoutExt(), StringComparison.CurrentCultureIgnoreCase));
    }

    /// <summary>
    /// 可执行文件是否运行
    /// </summary>
    /// <param name="filename">文件名</param>
    /// <returns>是否运行</returns>
    public static bool IsRun(string filename)
    {
        FileInfo info = new FileInfo(filename);
        return info.IsRun();
    }

    /// <summary>
    /// 获取无后缀的文件名
    /// </summary>
    /// <param name="file">文件信息</param>
    /// <returns>文件名</returns>
    public static string NameWithoutExt(this FileInfo file)
    {
        return file == null ? string.Empty : file.Name.Replace(file.Extension, "");
    }

    /// <summary>
    /// 判断一个文件是否正在使用
    /// </summary>
    /// <param name="file">要判断文件的文件名</param>
    /// <returns> bool</returns>
    public static bool IsUse(this FileInfo file)
    {
        if (file == null || !file.Exists)
        {
            return false; //文件不存在则一定没有被使用
        }

        bool inUse = true;
        try
        {
            using (new FileStream(file.FullName, FileMode.Open, FileAccess.Read, FileShare.None))
            {
                inUse = false;
            }
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message.ToString(CultureInfo.InvariantCulture));
        }

        return inUse; //true表示正在使用,false没有使用
    }

    /// <summary>
    /// GZip压缩文件
    /// </summary>
    /// <param name="file">文件</param>
    /// <param name="outfile">输出</param>
    public static void GZipCompress(this FileInfo file, string outfile)
    {
        if (file == null || !file.Exists)
        {
            return;
        }

        // Get the stream of the source file.
        using (FileStream inFile = file.OpenRead())
        {
            // Prevent compressing hidden and already compressed files.
            if (!((File.GetAttributes(file.FullName) & FileAttributes.Hidden) != FileAttributes.Hidden & file.Extension != ".gz"))
            {
                return;
            }

            // Create the compressed file.
            using (FileStream outFile = File.Create(outfile))
            {
                using (GZipStream compress = new GZipStream(outFile, CompressionMode.Compress))
                {
                    // Copy the source file into the compression stream.
                    inFile.CopyTo(compress);
                }
            }
        }
    }

    /// <summary>
    /// GZip解压缩文件
    /// </summary>
    /// <param name="file">文件</param>
    /// <param name="outfile">输出</param>
    public static void GZipDecompress(this FileInfo file, string outfile)
    {
        if (file == null || !file.Exists)
        {
            return;
        }

        // Get the stream of the source file.
        using (FileStream inFile = file.OpenRead())
        {
            // Get original file extension, for example
            // "doc" source report.doc.gz.
            string origName = outfile;
            //Create the decompressed file.
            using (FileStream outFile = File.Create(origName))
            {
                using (GZipStream decompress = new GZipStream(inFile, CompressionMode.Decompress))
                {
                    // Copy the decompression stream into the output file.
                    decompress.CopyTo(outFile);
                }
            }
        }
    }

    /// <summary>
    /// 根据完整文件路径获取FileStream
    /// </summary>
    /// <param name="file">文件</param>
    /// <returns>结果</returns>
    public static FileStream ReadStream(this FileInfo file)
    {
        FileStream fileStream = null;
        if (file.Exists)
        {
            fileStream = new FileStream(file.FullName, FileMode.Open);
            fileStream.Position = 0;
        }

        return fileStream;
    }

    /// <summary>
    /// 获取文本文件的行数
    /// </summary>
    /// <param name="filePath">文件的绝对路径</param>
    /// <returns>结果</returns>
    public static int LineCount(string filePath)
    {
        //将文本文件的各行读到一个字符串数组中，返回行数
        return File.ReadAllLines(filePath).Length;
    }

    /// <summary>
    /// 获取文本文件的行数
    /// </summary>
    /// <param name="info">文件的绝对路径</param>
    /// <returns>结果</returns>
    public static int LineCount(this FileInfo info)
    {
        //将文本文件的各行读到一个字符串数组中，返回行数
        return File.ReadAllLines(info.FullName).Length;
    }

    private static readonly uint[] Crc32Table =
        {
            0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
            0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
            0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
            0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
            0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
            0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
            0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
            0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
            0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
            0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
            0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
            0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
            0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
            0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
            0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
            0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
            0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
            0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
            0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
            0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
            0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
            0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
            0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
            0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
            0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
            0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
            0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
            0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
            0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
            0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
            0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
            0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
            0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
            0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
            0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
            0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
            0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
            0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
            0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
            0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
            0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
            0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
            0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
            0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
            0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
            0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
            0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
            0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
            0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
            0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
            0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
            0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
            0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
            0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
            0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
            0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
            0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
            0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
            0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
            0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
            0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
            0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
            0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
            0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
        };

    /// <summary>
    /// 获取文件的CRC32标识
    /// </summary>
    /// <param name="fi">文件信息</param>
    /// <returns>CRC</returns>
    public static string CRC32(this FileInfo fi)
    {
        const string FOO = "-";
        if (!fi.Exists)
        {
            return FOO;
        }

        // 最大50M
        const int MAX_SIZE = 50 * 1024 * 1024;

        if (fi.Length >= MAX_SIZE)
        {
            return FOO;
        }

        uint crc = 0xFFFFFFFF;
        var bin = File.ReadAllBytes(fi.FullName);
        foreach (byte b in bin)
        {
            crc = ((crc >> 8) & 0x00FFFFFF) ^ Crc32Table[(crc ^ b) & 0xFF];
        }

        crc ^= 0xFFFFFFFF;
        return crc.ToString("X").PadLeft(8, '0');
    }
}